/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * net/socket/net_vfcntl.c
 *
 *   Copyright (C) 2009, 2012-2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <sys/socket.h>

#include <stdint.h>
#include <stdarg.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>

#include <arch/irq.h>
#include <tinyara/net/net.h>
#include "socket/socket.h"

#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: net_vfcntl
 *
 * Description:
 *   Performs fcntl operations on socket
 *
 * Input Parameters:
 *   sockfd - Socket descriptor of the socket to operate on
 *   cmd    - The fcntl command.
 *   ap     - Command-specific arguments
 *
 * Returned Value:
 *   Zero (OK) is returned on success; -1 (ERROR) is returned on failure and
 *   the errno value is set appropriately.
 *
 ****************************************************************************/

int net_vfcntl(int sockfd, int cmd, va_list ap)
{

	FAR struct socket *sock = get_socket(sockfd);
	net_lock_t flags;
	int err = 0;
	int ret = 0;

	nvdbg("sockfd=%d cmd=%d\n", sockfd, cmd);

	/* Verify that the sockfd corresponds to valid, allocated socket */

	if (!sock) {
		err = EBADF;
		goto errout;
	}

	/* Interrupts must be disabled in order to perform operations on socket structures */

	flags = net_lock();
	switch (cmd) {
	case F_DUPFD:
		/* Return a new file descriptor which shall be the lowest numbered
		 * available (that is, not already open) file descriptor greater than
		 * or equal to the third argument, arg, taken as an integer of type
		 * int. The new file descriptor shall refer to the same open file
		 * description as the original file descriptor, and shall share any
		 * locks.  The FD_CLOEXEC flag associated  with the new file descriptor
		 * shall be cleared to keep the file open across calls to one of the
		 * exec functions.
		 */

	{
		ret = net_dupsd(sockfd);
	}
	break;

	case F_GETFD:
		/* Get the file descriptor flags defined in <fcntl.h> that are associated
		 * with the file descriptor fd.  File descriptor flags are associated
		 * with a single file descriptor and do not affect other file descriptors
		 * that refer to the same file.
		 */

	case F_SETFD:
		/* Set the file descriptor flags defined in <fcntl.h>, that are associated
		 * with fd, to the third argument, arg, taken as type int. If the
		 * FD_CLOEXEC flag in the third argument is 0, the file shall remain open
		 * across the exec functions; otherwise, the file shall be closed upon
		 * successful execution of one  of  the  exec  functions.
		 */

		err = ENOSYS;			/* F_GETFD and F_SETFD not implemented */
		break;

	case F_GETFL:
		/* Get the file status flags and file access modes, defined in
		 * <fcntl.h>, for the file description associated with fd. The file
		 * access modes can be extracted from the return value using the
		 * mask O_ACCMODE, which is defined  in <fcntl.h>. File status flags
		 * and file access modes are associated with the file description
		 * and do not affect other file descriptors that refer to the same
		 * file with different open file descriptions.
		 */

	{
		ret = lwip_fcntl(sockfd, cmd, 0);
	}
	break;

	case F_SETFL:
		/* Set the file status flags, defined in <fcntl.h>, for the file description
		 * associated with fd from the corresponding  bits in the third argument,
		 * arg, taken as type int. Bits corresponding to the file access mode and
		 * the file creation flags, as defined in <fcntl.h>, that are set in arg shall
		 * be ignored. If any bits in arg other than those mentioned here are changed
		 * by the application, the result is unspecified.
		 */

	{
		int mode = va_arg(ap, int);
		ret = lwip_fcntl(sockfd, cmd, mode);
	}
	break;

	case F_GETOWN:
		/* If fd refers to a socket, get the process or process group ID specified
		 * to receive SIGURG signals when out-of-band data is available. Positive values
		 * indicate a process ID; negative values, other than -1, indicate a process group
		 * ID. If fd does not refer to a socket, the results are unspecified.
		 */

	case F_SETOWN:
		/* If fd refers to a socket, set the process or process group ID specified
		 * to receive SIGURG signals when out-of-band data is available, using the value
		 * of the third argument, arg, taken as type int. Positive values indicate a
		 * process ID; negative values, other than -1, indicate a process group ID. If
		 * fd does not refer to a socket, the results are unspecified.
		 */

	case F_GETLK:
		/* Get the first lock which blocks the lock description pointed to by the third
		 * argument, arg, taken as a pointer to type struct flock, defined in <fcntl.h>.
		 * The information retrieved shall overwrite the information passed to fcntl() in
		 * the structure flock. If no lock is found that would prevent this lock from being
		 * created, then the structure shall be left unchanged except for the lock type
		 * which shall be set to F_UNLCK.
		 */

	case F_SETLK:
		/* Set or clear a file segment lock according to the lock description pointed to
		 * by the third argument, arg, taken as a pointer to type struct flock, defined in
		 * <fcntl.h>. F_SETLK can establish shared (or read) locks (F_RDLCK) or exclusive
		 * (or write) locks (F_WRLCK), as well  as  to  remove  either  type  of  lock  (F_UNLCK).
		 * F_RDLCK, F_WRLCK, and F_UNLCK are defined in <fcntl.h>. If a shared or exclusive
		 * lock cannot be set, fcntl() shall return immediately with a return value of -1.
		 */

	case F_SETLKW:
		/* This command shall be equivalent to F_SETLK except that if a shared or exclusive
		 * lock is blocked by other locks, the thread shall wait until the request can be
		 * satisfied. If a signal that is to be caught is received while fcntl() is waiting
		 * for a region, fcntl() shall be interrupted. Upon return from the signal handler,
		 * fcntl() shall return -1 with errno set to [EINTR], and the lock operation shall
		 * not be done.
		 */

		err = ENOSYS;			/* F_GETOWN, F_SETOWN, F_GETLK, F_SETLK, F_SETLKW */
		break;

	default:
		err = EINVAL;
		break;
	}

	net_unlock(flags);

errout:
	if (err != 0) {
		errno = err;
		return ERROR;
	}
	return ret;
}

#endif							/* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS > 0 */
